Deep-printing form and process for preparing same



Patented May 25, 1926.

assess LEVIE LEVISSON, OF THE HAGUE, NETHERLANDS.

DEEP-PRINTING FORM AND PROCESS FDR PRE?ARING SAME.

No Drawing.

My invention relates to a process for preparing deep printing forms with endless pattern upon a cylinder, to a process for preparing printed matter, such as paper and wall-paper, fabrics, oil-cloth, linoleum, and the like, and to articles manufactured according to these methods.

It is known to use deep-printing forms (cylinders) with endless pattern for printing paper and such like materials, as for instance wall paper. Such printing forms have been either hand-engraved, or they have been fashioned with a steel inolette smaller patterns had to be reprinted several times. hese processes require considerable time, and in consequence thereof are very dear, or they are not suitable for manufacturing large patterns, this being the case in using the steel molette. It has been tried already to prepare deep-printing forms with endless pattern, however a very complicated photographical deep printing method was used, yielding a deep printing form with endless pattern, the image effect being obtained by means of printing elements of the same depth and different surface, substantially as is the case in the art of autotypehigh-printing. This process gives rise to such difficulties that it is not possible to use the same on a technical scale. The principal result obtained according to my invention, to wit, a breaking up in printingelements of different depth dimensions, could not be obtained by the known process referred to above.

According to my invention I use, in order to obtain deep-printing forms with an endless pattern, i. e., without seam the modern deep-printing-process, and I place a screened gelatine transfer which has been exposed to the light under a diapositive upon the cylinder, and develop the same, whereupon the cylinder is etched. This process is known in itself for dis-continued patterns, which have to be broken up, such as, e. g, images and such like printing matter, but not for endless patterns. it is however impossible to apply this process for the production of endless patterns, and a special method of transfer is required, which forms the subject of my invention.

My process for producing deep-printingforms with endless patterns is characterized by this that in using the p'hotomcchanicat deep-printing process with breaking up the Application filed July 14, 192- Serial N0. 575,050.

image in printing-elements of different depth, the transfer of the exposed gelatine To produce printed paper, wallpapery falr rirs, oil-cloth, linoleum and such like produ with endless pattern I use, according to my invention, deep-printing-forms with endless patterns, prepared according to my process as set forth above.

In order that my invention may be better understood and to enable those skilled in the art to carry out the same, the following example is given:

The diapositive of the image or pattern to be reproduced is copied upon sensitized. screened gelatine paper and the copy is transferred to the metal cylinder and developed. The further treatment of transfer is known in the art, so I need not describe it here.

As this transfer is impossible without using so-cailed safety-margins, and as the pattern in using the known process cannot be trasferred tight-closed around the cylinder I produce the deep-printingforms in such a way that the transfer of the copy to the cylinder takes place in at least two successive series of complete treatments.

In this way I succeed in producing deepprinting cylinders with endless patterns in real deep-print-etching with half tones.

By using the right way of dividing the copy before I transfer the same to the cylinder I succeed in producin deep-printing reproductions which do not show any combining line. Moreover, a correct transfer of the half-tones is obtained, which could not be done so easily in the desired way up to now.

In order to obtain printed wall-paper I proceed for instance as follows:

I use a diapositive with a pattern of which on every point the length corresponds with the circumference of the cylinder. The ends of the pattern are formed in such a way that in bendingthe same into the form of a cylinder the two ends fit closely into each other, giving an endless pattern. For making the gelatine transfer I divide the diapositive into two parts according to a line parallel to the axis and from one of these parts of the diapositive a chromated gelatine printing is produced, the latter being transferred and etched to the cylinder customarily. Thereupon the second part is being transferred to the cylinder and etched. The s0-called safety-margins are in this Way not disturbing my process for obtaining an endless pattern.

I claim:

1. A process for producing deep-printingforms with endless pattern, comprising us ing the photomechanical deep-printing process with breaking up the image into printing-elements of difierent depth, and carrying out the transfer of the exposed gelat-ine layer on to the cylinder by breaking the layer into a plurality of portions, and succes sively subjecting each portion to a series of complete treatments.

2. In a process of preparing printed paper, Wall paper, fabrics, oilcloth, linoleum and other printed matter with half tones using deep printing forms with endless pattern produced by using the photomechanical deep-printing process with breaking-up the image into printing-elements of different depth, and carrying out the transfer of the exposed gelatine layer on to the cylinder and the further treatment thereof in at least two successive series of complete treatments.

In testimony whereof I affix my signature.

LEVIE LEVISSON. 

